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Патент USA US2137972

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Nov. 22, 1938.
H_ 5_' BAKER ET AL _
’
2,137,972
ILLUMINATED GAUGE
Filed May 7, 1936
KIM/5%
///
2,137,972‘
Patented Nov. 22, 1938
UNITED ‘STATES PATENT OFFIQE
Harry S. Baker, Arlington, and‘Joseph W. Moth-v
erwell, Meli'ose, Mass, assignors to The Ashton
Valve Company, Cambridge, Mass, a corpora
tion of Massachusetts
Application May "7, 1936, Serial No. 78,358
>3‘Glaimsr; (Cl. 240—2.1)
Illuminated gauges used in certain locations,
at the opening referred to below, is pliable pack
such as in connection with cabs in locomotives,
ing or gasket 6‘ of felt or other suitable mate
are subjected to the action of» variousgharmful
elements, such as dust, smoke, soot, greases and‘
rial. A-similar packing 6EL is also provided be.
tween the top of the body portion I and the
lower machined face of horizontal extension 61. 57.
Since the packing or gasket 6% is horizontal there
5 oil. The principal purpose of’ our invention is
to prevent the harmful action- of» such elements
on the gauge dials, on the electric lamps or
is. no gasket edge upwardly presented and thus
particularly exposed to oil, water, or other for
eign materials which might tend to deteriorate
other illuminating means, and on the-operating
mechanism.
Such harmful elements dull -or
the packing or work into the joint.
10' darken the dials; blacken orcloud the electric
lamp bulbs, reducing the illuminating power;
and clog or coat the operating vmechanism of the
gauge.
_
.
l for the illuminating means. ,
and carries the electric lamp 9 and lamp base
9“ and it is perforated at 10 for passage of suit
able wires to conduct current to the lamp, which
is‘shown as substantially vcylindrical in outline
A feature of our invention is making the hous
portion of the gauge casing and preferably in
tegral with the face cover of the dial or =dials.
This permits dial covers of various types ‘and
with or without illuminating means to be asso
ciated interchangeably with the gauge casing.
Another feature resides in the relationship be
tween the mating portions of the cover member
and the gauge casing in accordance with which
all the joints between these parts can be provided
25 readily with gaskets so as to make them dust
and oil-proof and so positioned as to protect the
'
v
Still another feature is the mounting oflelec
In the drawing
-
r
W
r
-
Figure 2 is a section on line 2-2 of Figure 1;
Figure 3 is a section on line 3—3‘ of Figure l;
and
Figure 4 is an enlarged detail of the latch
member.
The gauge casing comprises metal body por
40 tion I and metal face'cover 2, the latter being
held to the body portion by screw 3 and having
an integral horizontal extension 4 overlying the
top face of and held to the body portion by
screws 5. The screws 3 and 5 provide means for
45 tightening the face cover to the casing making a
I A
r
’
-
The cap has anannular turned male portio
l-2 to engage and ?t the turned female portion
l3 of the housing, the portion-‘i3havin'g an an
nular shoulder l3a between which .and cap 8 is 25.
located packing IS‘). The portion 12 is of suffi
cient length to provide proper alignment and
the portions [2 and 13 act to accurately position
proper position for proper diffusion of light along
>
The cap'8 carries two pins Ba and 8b, which
engage, respectively, latch members 14 and I5,
each of the latter being slotted, as at 16 and Eta,
so that the latch members may be adjustedto 35
make up for wear and especially to make up for
any wear on the annular packing l?b, similar to
packing 6, between the machined end of the
housing and an adjacent machined portion l6“
of the cap.
Screws I‘! engage the housing to
40
hold the latch members in adjusted position.
Each latch member, as in Figure 4, has a pro
jecting spring portion 18, the inner face of which
has a cam surface 18° and is formed with a
marginal rim portion surrounding the open
shoulder l8“, toward which, along cam surface 45
l8”, the pin may be moved and beyond which pin
8a or 8b may be moved, portion l8 moving out
wardly to permit this, and then springing in
front of the casing body portion I, which, ex
wardly to latch the pin in the recess between
cept at the extension 4, overlaps the portion I to
a relatively short distance. This rim thus over
laps the edges of the gasket 6 and holds it in
position when the parts are being assembled.
jecting inwardly slightly more than projection
l8a and limiting rotary movement of the pin
dustproof joint.
The horizontal extension 4 forms part of a
All the way around between the smooth face of
55
ries pins 81* and-‘8hr
the dials.
~
Figure 1 is an elevation of a gauge embodying
our invention;
and with its axis horizontal‘. The cap may have
one or more projecting portions H to facilitate
turning of the cap, as described below and car 20
and center the. lamp so that it will be in the
trical mechanism on a cap which is mounted on,
but removable from, said housing.
'
~ Cap 8 is suitably mounted on the housing ‘I
v
15 ing for the illuminating means integral with a
edges of the gaskets.
101
.
Integral'with the ‘face cover 2 is the housingv
the body portion l and the glass plate 2*‘, except
shoulder we and shoulder tab, the latter pro
50
8% and cap 8 with relation to the housing ‘I.
The spring portion l8 holds the cap ?rmly'in
position in the housing ‘I, the curvature between 55
.
2
2, 137,972
shoulders I8a and [8b corresponding with the
curvature of the exterior of the pin.
The cap 8 is readily removable Without de
taching of Wires or cables connected to the cap
because the spring portions of the latches will
be pressed outwardly asthe cap is rotated coun
said casing back of said front, a face cover for
closing said open front spaced from said dial,
said face cover having a lamp housing at the
top and a rim portion surrounding said open
front and overlying the side and bottom walls of
said casing a relatively short distance, the top
terclockwise looking from the right end in Fig
of said rim portion being rearwardly extended
ure 1.
a substantial distance from said lamp housing,
a gasket between said extended rim portion and
said casing, and means for clamping said face 10
cover downwardly to effect a tight gasketed joint
between said casing and face cover, said lamp
Shafts I9 and l9a may be suitably operated (as
10 by a Bourdon spring and associated mechanism
not necessary to be shown) and carry indicators
20 and 22 to cooperate with the markings on
dials 2| and 23. In the particular form shown
we illustrate two indicators Hand 22 cooperat
ing respectively with dials 2|v and 23.
Glass plate 28‘ is held in place between an in
ner portion of the face cover 2 and the packing 6.
An opening 24 is provided along the top of the
body portion to permit the lamp to illuminate
the dials.
The gauge has threaded sockets 25 for pres
sure connection and the gauge may be suitably
held in place by the lugs 26, through whose per
forations screws may be passed to engage a suit
25 able support.
.
Among the advantages of our invention we
housing and casing having registering openings
for passage of light from said lamp housing to
said dial.
15
2. A device of the class described, comprising
a casing having an open front, a dial carried
by said casing back of said front, a face cover
for closing said open front spaced from said dial,
said face cover having a lamp housing at the 20
top and a rim portion surrounding said open
front and overlying the side and bottom walls of
said casing a relatively short distance, the top
of said rim portion being rearwardly extended a
substantial distance from said lamp housing, a 25
gasket between said extended rim portion and
may point out that it is dustproof especially by
said casing, means for clamping said face cover
reason of the integrality of the housing and a
portion of the gauge casing and by reason of the
30 packing or gaskets sealing, and making a dust
downwardly to effect a tight gasketed joint be
tween said. casing and, face cover, said lamp
proof joint between, all adjacent machined sur
faces of the face cover, lamp housing and gauge
casing; that the cap for the lamp housing is
readily removable without the necessity of dis
35 connecting wires or cables and especially with
out servicing by skilled electricians; and that we
provide a very accurate, and preferably adjust
able, spring latch member for guiding the cap
to position and for holding‘ it there properly
40 centered so that the lamp is properly positioned
with relation to the housing and with relation to
the opening at the, top of the body portion. It
‘will also be noted‘ that by forming ‘the lamp
housing and easing having registering openings 30
for passage of light from said lamp housing to
said dial, said lamp housing being tubular and
having an open end, a plug closing said open
end, and a lamp carried by said plug and extend
ing into said housing when said plug is in clos 35
ing position.
3. A device of the class described, comprising
a casing having an open front, a dial carried by
said casing back of said front, a face cover for
closing said open front spaced from said dial, 40
said face cover having a lamp housing at the
top and a rim portion surrounding said open
front and overlying the side and bottom walls of
housing integral with the face cover it is con
said casing a relatively short distance, the top
45 venient to arrange the longitudinal axis of the of said rim portion being rearwardly extended a 45
housing in the central plane of the slot or open
substantial distance from said lamp housing, a
ing 24 in the casing and the mating slot or pas
gasket between said extended rim portion and
sage in the housing which is in front of the dials said casing, means for clamping said face cover
2| and 25. Thus, that part of the casing back downwardly to effect a tight gasketed joint be
tween said casing and face cover, said lamp 50
60 of the dials, and which encloses the pressure
responsive mechanism, remains closed and pro
housing and casing having registering openings
tected against admission of foreign matter even for passage of light from said lamp housing to
when the housing 1 is open, as when the lamp said dial, said lamp housing being tubular with
9 is to be renewed. The lamp itself, also, is in its axis arranged in a plane substantially par
55 the best position to illuminate the dials without allel to and between said face cover and dial, and 55
undesirable re?ection or glare, the front of the having an open end, a plugclosing said open
cover through which the dials are visible being end, and a lamp carried by said plug and extend
spaced forwardly of the dials, and the light ing into said housing when said plug isinclos
shining in from the top through this space.
ing position.
60
What we claim is:
l. A device of the class described, comprising
a casing having an open front, a dial carried by
HARRY S. BAKER.
JOSEPH W. MOTHERWELL.
60
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